[Go-essp-tech] CMIP5_Amon pfull/phalf
Sébastien Denvil
sebastien.denvil at ipsl.jussieu.fr
Wed Nov 17 02:09:11 MST 2010
Hi Denis,
we have the same error as you have, and I guess everyone with
alternate_hybrid_sigma will follow the same track.
My understanding of what's going on and a possible workaround is (even
tough not implemented yet) :
- The difference between time1 and time2 is that time2 is a
climatological axis : cell_methods: time: mean within years time: mean
over years
- But when you describe your vertical axis, the pressure level should
have the same time axis as plev/phalf
- So your pressure level should be as well on a climatological axis and
should be the result of a climatological mean.
- Not the same pressure level to describe pfull/phalf and the other
variables having an alternate_hybrid_sigma vertical.
Create another entry for ps (let's say ps2) but with climatological time
axis :
variable_entry: ps2
...
formula: p(n,k,j,i) = ap(k) + b(k)*ps2(n,j,i)
z_factors: ap: ap b: b ps2: ps2
z_bounds_factors: ap: ap_bnds b: b_bnds ps2: ps2
dimensions: longitude latitude time2
Generally speaking it could be clearer to have a CMIP5_Aclim as we have
CMIP5_Oclim table for ocean climatological field.
FYI the cmor-list is the most appropriate one for this question.
Regards.
Sébastien
Le 16/11/2010 23:54, Denis Nadeau a écrit :
> Hi,
>
> I am trying to create phalf and pfull variable using
> "alternate_hybrid_sigma".
> I am having trouble due to the 2 time axis.
>
> 'time2' is needed by "pfull" and "phalf"
>
> variable_entry: phalf/pfull
> ....
> dimensions: longitude latitude alevhalf/alevel time2
>
>
> 'time' is needed by "alternate_hybrid_sigma"
>
> variable_entry: ps
> ...
> formula: p(n,k,j,i) = ap(k) + b(k)*ps(n,j,i)
> z_factors: ap: ap b: b ps: ps
> z_bounds_factors: ap: ap_bnds b: b_bnds ps: ps
> dimensions: longitude latitude time
>
> I tried to create 2 time axis, one for 'ps' and one for 'phalf' or
> 'pfull' but I get an NetCDF error.
>
>
> Do you know how to create 'phalf/pfull'?
> What is the difference between axis 'time' and 'time2'
>
>
>
> Thanks,
> Denis
>
>
>
>
--
Sébastien Denvil
IPSL, Pôle de modélisation du climat
UPMC, Case 101, 4 place Jussieu,
75252 Paris Cedex 5
Tour 45-55 2ème étage Bureau 209
Tel: 33 1 44 27 21 10
Fax: 33 1 44 27 39 02
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